Shock-absorber.



GEORGE CUSHING MARTIN, 0F LOS ANGELES, CALIFORNIA.

SHOCK-ABBOBBER.

specification of Letten Patent.

Patented Aug. 6, 1912.

Application tiled Iulry 7, 1909. Serial No. 506,407.

To all whom it may concern:

Be it known that I, Groen CUsHiNG MARTIN, a citizen of the UnitedStates, residing at Los Angeles, in the count of Los Angeles and Stateof California, ave invented new and useful Improvements inShock-Absorbers, of which the following 'is a. specification.

This invention relates to im rovemeiits in a certainshock-absorberdescribed in an application for Letters-Patent of the*v United Statesfiled by me on the 10th da of April, 1909, Serial No. 489,214fiii whicisshown a slip rod extending into a case and frictionally engaged h v atoggle-joint operated brakeshoe when moved lengthwise in one direction.

Objects of this invention are:

(1.) '1.0 provide a more positive and easily manipulated adjustment ofthe pressure of the brake-shoe von the slip-rod;

(2.) 'lo-provide novel means for taking up thc movement of theshock-absorber in all directions; that is,-to provide the device with aneffective universal joint;

(3.) To provide a resilient device in connection with the ivot whichforms the principal clement o the toggle-joint whereby pressure on theslip-rod may be regulated and whereby the said pressure may e constantlymaintained in case the rod may or may not wear more in one place than inanother; and to provide means for taking up, through the action of saidspring, wear on various parts of the device.

(4.) To provide a novel shoe which engages frictionally the slip-rod andis so arranged as to move freely upward with the upward motion of theslip-rod, thereby reducing the pressure of said shoe on said slip-rod,and to provide for forcing said shoe downward on the instant that thesliprod starts to move downward, thereby friclionally engaging the saidlslip-rod.

(5.) 'l`o make )rovis'ion whereby the frictional surface o said slip-rodmay 'be increased, without maieriall)y increasing thil weight or size ofthe device. This is accomplished by using in the place of a siiigle-pcreslip-rod a multiple slip-rod which may be formed of two or more parallelfiat pieces. strips or sections runnin 'through the case of theshock-absorber an arran ed in much the same manner as the former s ip-Irod; the arallel portions of the slip-rod being hel apart by a shoewhich remainsstationary when the slip-rod moves in either direction. Thesli -rods may be variously formed but referably will be fiat with thebroad sides tween and engaging the shoes, and the number of slip-rodmembers ma be increased if it is desired to increase the frictionsurface. The sli -rod members may be fastened together at tie bottom inany suitable way as by means of a bolt riining through an eye-piecewhich will be used for fastening the slip-rod to the axle, and the partsabove mentioned may be separated by soft rubber washers to preventrattle.

6.) An object is to provide a shock-absor r the resistance of which tothe recoil of the spring will be proportional to the force of suchrecoil, and which will alitomatically offer high resistance to therecoil of the highly-compressed spring, and will not offer anyresistance to the easy motion of the automobile-springs in their normalposition under a normal load.

The accompanying drawings illustrate the invention iii the form atpresent deemed most desirable.

Figure 1 is an elevation artly in longitudinal mid-.section on lineindicated by a, Figs. 3 and 4. The removable side is omitted from thenon-sectioned portion'. Fig. Q is a transverse section on line:indicated by m2, Fig. 1; theside wall being fastened in place. Fig. 3is an elevation from the arrow 3 in Figs. l, 4 and 5. Portions of theframe and of one leaf of the spring are shown in section. Fig. 4 is aplan section from irregular line Fig. 1. Fig. 5 is a view of theappliance attached to one side of a vehicle, a fragment of which isshown. This view is from the arrow 5 at the right of Fig. 3. Fig. (i isa detail of the taper slipiod which is shown in edge elevation.

The bracket 1 is mounted on the (ish-plate 2 which is fastened to thetop of the spring 3 by the clip 4 havingr nuts said lish-plati 2 havinora bent seat in which is titted thc bur 7 oi the frame of the vehicle, tothe axle t5 of which vehicle the lower portion of the spring 3 issecured b v the clip S) to which the slip-rod foot is fastened by boltsll. The slip-rod may be pvoted to the foot 10 by a bolt 1'2 the axis ofwhich is at right angies vto the vehicle axle 8 and parallel with thespring 3, and said slip-,rod muy consist of one or more members, aplurality of menibers bein preferred.

#In lthe rawings, two parallel members 13 CGH 327K. C(

" ae the springs l am? m: if*

ISG

due to the extra thickness of thel slip-rod, and the resiliency of thespring-35 allows the toggle-joint to assume a position nearly at rightangles to the slip-rod where 'it ex.- erts its most effective forceun'iilv the thinner portion of the sliprod is. reached; the spring 35being constructed to positively support the togglebansuppoit 34. inapproximately .the vposition shown in Fig.,1, ex'cept when 1v5l-thetoggle-bar is brought near right-angled position as above stated. Inthis way the 4shock'absorber automatically. accommodates itself to allconditions; that is, it does not grip the slip-rods at all in a normalposition, but grips them with an increased grip as the bump is increasedor the compression :of the spring is increased.

, .Itis not important that the upper portion of the slip-rod be tapered,but the taper may eittend from end to end of the taper-section.

AIt, is not necessary that the slip-rod shall be.

bina'tion of two elements, means to resilopposition to the thrust vofthe togg iently hold said elements.apart,.and mechanism constructed -tovyieldin ly resist the vparting movement of said eements when theelements are abnormally near each other., and to offer comparativelyslight resistance to the parting movement when the elements are normallyspaced apart, I have preserved free resilient movement when the springsare not abnormally compressed, and I avoid any action of the springswhich will tend to cause the vehicle-body to bound.

1. Thecombiiiation with a'. case, of a sliprod comprising a plurality ofsections longitudinally movable in the case, a plurality of shoes toengage the slipmod sections, a toggle-bar support, a toggle-bar betweensaid support and the shoes to o perate the shoes, and a spring to holdsaid su port in 2. The combination with a case, of va sliprod comprisinga plurality ot sections longitudinally movable in the case, aplurality`4 `of shoes to engage the 'slip-rod sections, a

togzglebar support, a toggle-bar between said support and the shoes tooperate the shoes. a springy to hold said support in oppo- Sltiflli tothe thrust of the togglefhar. and

mea "adjusting-tlwALen sione-o Y -t he sprl ng.

3. In a shock-absorber, Athe combination with acaso, of a slip-rodVmovable said case, means operable by the movement of the slip-rod in onedirection to frictionally' resist such movement, ay resilient supportfor said means, an upwardly-tapering wedge to adjust said support, and abolt with nuts toadjust the wedge. Y l

4. In a shock-absorber provided slip-rod and frictional mechanisr'i'iYtherefoft, the combination with. a case, of a bolt exsk tending throughthe. case and provided with' t a neck inside the case, nuts to adjustthe bolt'- in the case, and a wedge provided witlra;

slot on` said neck and movable therewith for Athe purpose of adjustingthe frictional mechanism of the shockabsorber. y

5. In a shock-absorber, thq'mbination of a case, a slip-rod in the case,awedge-block on one side of the slip-rod, springV to hold said block inwedgin position, a brake shoe on the other side o'f t e slip-rod, aspring tof hold the brake-shoe in wedgingposition,

and a toggle-bar operable by the movement of said brake-shoe to c'ausesaid' shoe Jafrictionally engage the slip-rod when said slipvrod movesin -the direction in ,which it is pressed by the spring.` V- 6. In ashock-absorber, the combination of "a case, a slip-rod. in the case, awedg'eblock on one side of the slip-rod, a spring tohold said block inwedgin'g position, a brake-Shoe on the other side vot' the sliprod, aspring to 'hold the brake-shoe in wedging position, a

tog le-bar-operable by the movement -of sait? brake-shoe to canse .saidshoeto frictionally engage the slip-rod when said slip Aa case, aslip-rod in the case, a wedge-block Arod moves in the direction inkwhich it. is

on one side of the slip-rod', a springjto'hold said block inwedgingposition', a brake-.shoe

on theothe-r side of the slip-rod, a spring-to' hold the brake-shoe inwedging position, a i

toggle-bai' operable by the `movement of said brake-shoe to cause saidshoe to frictionally engage the slip-rod when said slip-rod moves` inthe direction in which it is pressed by the spring, and means forresiliently resisting the thrust of the toggle-bar, said slip-rod beingprovided niith a taper port-ion to loosen the shoe on thc reversem'ovei'iient of 8. In `o. shock-absorber, thel` combination with a case,of a slip-rod comprising two sections one' o which has` parallel sidesand theotlier ofwhich tapers, a wedge-block to engage one of saidparallel sides, a. separating'block between the sect-ions,:Vl'iiakeshoeengaging the tapering sectionganda togglebar operalileby v the-shoe"tffrictionui yengage'andhild the taper-section when it moves iii thedirection of its `thicker end and to neleasewhen the shoe moves inreverse direction. A

9. In a shock-absorber, the combination with a case, of `a" slipl-rodcomprising two sections one ofwhichhas parallel sides and the other ofwhich tapers', a wedge-block to engage one of said parallel sides, aseparat-v ing-block between the sections, a brake-shoe engaving thetaperin section springs to holdothe Wedge-block ind 4brake-shoe, and atogglebar operable bythe shoe to friction ally 'engage andhold thetaper-section when',

and hold the taper-section when it moves in.-

the direction of its thicker'encl 'zand `to re-v lease when the rodmovesvin fthe reverse di.-

rection. andv a resilient support for the t"tffsle-lmr. 1 Y Y y "1.1.vIn itnsliocl{-ab`so'r-ber,,the combination with a, ease,V of a slip-rodcomprising ftwo sections one of which has parallel sides and' theother'of which tapers,r'a.'wedgeblockito engage'oe of said pai'allelsidesfaseparat-A inghblo'clr,.betweenv the sections, a brake-.shoe engaging thetapering fsection, springs to hold the wedge-block and vbrake#shoe, a...toggle-bnnoprnble by the shoe' to friction-,-

ally engage vand hold'the taper-section ,when it movesA In thedirectionof its thicker end and torelease 'verse direction, and aresilient support for the toggle-bar.

the Y whenV then-odv moves in fhgrr 12. In a Shoclrabsorber, theCombination with a case, of a slip-rod comprising two sections one ofwhich has parallel sides amilY the` other of which tapers, a Wedge-blockto engage one of said parallel sides,'a separating-block between thesections, a brakeshee engaging the tapering section, a toggle-baroperable by the shoe to rictionally. engage and hold the ta er-sectionwhen it nieves in the direction p its thickereend and to release whenthe rodA moves in the yreverse li- Yrection, a resilient'support for thetoggleba.r, and means for adjusting saidlresilient support.

13. In e.A shock-absorber, the-combination with a case, o a sii -rodcomprising two sections one or which as parallell sides and vthe otherof which tapers, a wedge-block to engage one of said parallel sides, aseperating-block between the sections, s. brake-shoe engaging'- thetapering .section, springs to hold thewedgebleck :ind brake-shoe, e.togg1e-bar operable by the shoe toI frictionyally engageand hold thetaper-secton whenA it movesA 1n the direction of itsv'thieker end andtorelease when the rod moves inA the reverse direction, aresilientsupport for the togglebar, and means for 'adjusting seid, re-

silient support. I14. The combination with e sliprodhaving relativelythick and thin portions, of a Ibrake-shoe to engage such siip-rod, atoggle,- I berrsnppert, resilient means to hold said support,A and atoggle'bar between sai brakeshoeand the support. l

In testimony whereof, have hereunto setv my hand at Los Angeles,California-,this 2d day of July, 1909. f v

1 t GES. CUSHING- MARTN.

' Jeune R; TowNemNn,

L. BELLE Rien.

